Sayang, ada dizziness + headache + perut sakit together macam ni, kena check dengan doctor ya, bisa jadi banyak reasons, dari dehidration sampai something else yang perlu proper check-up. Jangan delay, terutama if it's getting worse or you're pregnant/breastfeeding, go see your GP or walk-in clinic, ok? Better safe than sorry. Let me know how it goes!